+test_begin_subtest "Search handles subprocess warnings"
+cat > notmuch_fail <<EOF
+#!/bin/sh
+echo '()'
+echo This is a warning >&2
+echo This is another warning >&2
+exit 0
+EOF
+chmod a+x notmuch_fail
+test_emacs "(let ((notmuch-command \"$PWD/notmuch_fail\"))
+ (with-current-buffer \"*Messages*\" (erase-buffer))
+ (with-current-buffer \"*Notmuch errors*\" (erase-buffer))
+ (notmuch-search \"tag:inbox\")
+ (notmuch-test-wait)
+ (with-current-buffer \"*Messages*\"
+ (test-output \"MESSAGES\"))
+ (with-current-buffer \"*Notmuch errors*\"
+ (test-output \"ERROR\"))
+ (test-output))"
+sed -i -e 's/^\[.*\]$/[XXX]/' ERROR
+test_expect_equal "$(cat OUTPUT; echo ---; cat MESSAGES; echo ---; cat ERROR)" "\
+End of search results.
+---
+This is a warning (see *Notmuch errors* for more details)
+---
+[XXX]
+This is a warning
+This is another warning"
+